Ways to sign in

Hi, I´ve tried out to turn off the show of “index.php” in my URL´s. But I´ve missed to add the Appache stuff to my .htaccess file. My site is not available anymore, so I´m wondering how to log in to change any settings again. Since I´m only loggin into my site via the “sign in” button on the site. Does anybody have any hint for me?
Or as alternative, what do I have to change to reset the option?

Add this to your htaccess file

<IfModule mod_rewrite.c>
	RewriteEngine On
	RewriteBase /
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME}/index.html !-f
	RewriteCond %{REQUEST_FILENAME}/index.php !-f
	RewriteRule . index.php [L]
</IfModule>

Thank you. I found the code in other threads before and also tried to include it into (all) .htaccess files I found in my directories. But this was the wrong way. Since there was no .htaccess file in the main folder, I had to add it.

I further found the file that allowed me to change the setting for not redirecting my request if I want to sign in under: …/application/config/generated_overrides/concrete.php